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 The e23 745i and Turbocharged BMW Motor Topics
 BMW M106/M102/M30 Turbo Topics
 waste gate...anyone look into this?
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dans bruser7
Master Technician

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206 Posts

Posted - Jan 24 2005 :  12:32:39  Show Profile  Reply with Quote
7950041577 on eiobay...what say the group, anyone look into this type unit before, could it work for our 1/4 to 8's...

Dan Williams
aka danw2002
85 745 'Zeke',
67 2000a 4 dr'Rufus'
70 2002ti/m20 many mods,
57 isetta, 76 R90/6 MC
a BMW nut ball....

Afshin-Switzerland
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1847 Posts

Posted - Jan 24 2005 :  22:09:45  Show Profile  Reply with Quote
Dan this is not a waste-gate but a blow-off valve. This is by the way the exact the same as I've purchased for mine. So far it seems to work fine on mine but I've only had a few runs to try if my newly fited motronic engine runs fine (which it does ) ... so still haven't got enough experience with it to tell you if it's definately a fine product More to come in next spring time ... it's icey and snowing out there, looks like it's never ending

Regards, Afshin.
1982 745i (5-Speed)


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dans bruser7
Master Technician

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206 Posts

Posted - Jan 27 2005 :  12:45:47  Show Profile  Reply with Quote
right, it does not devert but just relives pressure, so you use it with your wastegate? or replace your wastegate with it?

Dan Williams
aka danw2002
85 745 'Zeke',
67 2000a 4 dr'Rufus'
70 2002ti/m20 many mods,
57 isetta, 76 R90/6 MC
a BMW nut ball....
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Jon 86 745 MS
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1423 Posts

Posted - Jan 27 2005 :  19:55:47  Show Profile  Reply with Quote
Blow off valve works like this, what happens when your throttle plate slams shut with turbo pressure on it? It back pressures the turbo blades and causes the turbo to stall. This happens every shift on a manual gearbox car. This device is put between the turbo and the throttle plate. When the plate slams shut and pressure go up this valve opens and releaves it thus releasing any pressure that might stall out the turbo.

Jon Jacobs
85 Korman 745i (AKA Das Borg) R.I.P.
86 745i (Die Rakete)(no mas :(
1.2 bar + Boost with
Team WWW.745i.com Performance Parts
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Afshin-Switzerland
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1847 Posts

Posted - Jan 27 2005 :  23:10:24  Show Profile  Reply with Quote
Jon the waste-gate master said it all [10]

Regards, Afshin.
1982 745i (5-Speed)


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dans bruser7
Master Technician

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206 Posts

Posted - Jan 28 2005 :  20:01:29  Show Profile  Reply with Quote
so this would be great to add for those that are converting to manual and dont have the jettronic set up from the sharknose ones, but us with autos, dont really need this...am i close??

quote:
Originally posted by Jon 86 745 MS

Blow off valve works like this, what happens when your throttle plate slams shut with turbo pressure on it? It back pressures the turbo blades and causes the turbo to stall. This happens every shift on a manual gearbox car. This device is put between the turbo and the throttle plate. When the plate slams shut and pressure go up this valve opens and releaves it thus releasing any pressure that might stall out the turbo.


Dan Williams
aka danw2002
85 745 'Zeke',
67 2000a 4 dr'Rufus'
70 2002ti/m20 many mods,
57 isetta, 76 R90/6 MC
a BMW nut ball....
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Afshin-Switzerland
Over 745 Posts!

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Posted - Jan 29 2005 :  08:05:55  Show Profile  Reply with Quote
Yes you're not that far But even with an auto tranny, if you dial higher boost levels than OEM you'll need this valve. This's because in case of boost levels higher than ... so say around 0.7 bar, you start to damage seriously your tubo by going out of gas pedal under boost (for braking for example) it will hit back hard on your turbo's propel when it got no way out

Regards, Afshin.
1982 745i (5-Speed)


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dans bruser7
Master Technician

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206 Posts

Posted - Feb 02 2005 :  11:05:48  Show Profile  Reply with Quote
ah, clear now. thanks....

Dan Williams
aka danw2002
85 745 'Zeke',
67 2000a 4 dr'Rufus'
70 2002ti/m20 many mods,
57 isetta, 76 R90/6 MC
a BMW nut ball....
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ra0507
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1222 Posts

Posted - Feb 02 2005 :  15:57:20  Show Profile  Reply with Quote
It appears that what you are saying is that any of us with Motronic, a software upgrade and wastegate mod needs to install this (presuming that we run in excess of 0.7 bar). Am I correct? If so, where does it get installed?

Rick
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cliffo
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Posted - Feb 02 2005 :  22:08:47  Show Profile  Reply with Quote
in the auto's, wouldnt the "chipped" motronic still have control over "overboost", as when the throttle slams shut after taking your foot off quickly, venting said pressure through pulsing the wastegate, or is the modified wastegate no longer controlled by the solenoid switch?
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Afshin-Switzerland
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Posted - Feb 03 2005 :  00:07:51  Show Profile  Reply with Quote
quote:
Originally posted by ra0507

It appears that what you are saying is that any of us with Motronic, a software upgrade and wastegate mod needs to install this (presuming that we run in excess of 0.7 bar). Am I correct? If so, where does it get installed?

Rick



Rick, this is absolutely true [20] I even wonder how come it's ignored so massively from our "over-boosted" comunity here

This is a fact that your turbo will get a shorter life without this valve to let out the excedent hight boosted air which's going to slamm back on turbo's propel / shaft ... not to say that you'll get alot more turbo-lag if you reacclerate right after

You can fit it anywhere between intercooler and throtle body. In my case I've fited it after intercooler right behind the head lights.

BTW, now I like this valve even better than OEM L-Jet system which re-route the high boosted air, back into air-intake side of turbo. This OEM L-Jet system would re-introduce an already heated up boosted air into turbo's intake ... in my case it's blowen-off in the air & turbo will ONLY get the fresh & cool air from air filter's intake.

Regards, Afshin.
1982 745i (5-Speed)



Edited by - Afshin-Switzerland on Feb 03 2005 00:20:00
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